diff options
Diffstat (limited to '')
-rw-r--r-- | libraries/LuaJIT-1.1.7/src/lstrlib.c | 871 |
1 files changed, 871 insertions, 0 deletions
diff --git a/libraries/LuaJIT-1.1.7/src/lstrlib.c b/libraries/LuaJIT-1.1.7/src/lstrlib.c new file mode 100644 index 0000000..fe452ce --- /dev/null +++ b/libraries/LuaJIT-1.1.7/src/lstrlib.c | |||
@@ -0,0 +1,871 @@ | |||
1 | /* | ||
2 | ** $Id: lstrlib.c,v 1.132.1.4 2008/07/11 17:27:21 roberto Exp $ | ||
3 | ** Standard library for string operations and pattern-matching | ||
4 | ** See Copyright Notice in lua.h | ||
5 | */ | ||
6 | |||
7 | |||
8 | #include <ctype.h> | ||
9 | #include <stddef.h> | ||
10 | #include <stdio.h> | ||
11 | #include <stdlib.h> | ||
12 | #include <string.h> | ||
13 | |||
14 | #define lstrlib_c | ||
15 | #define LUA_LIB | ||
16 | |||
17 | #include "lua.h" | ||
18 | |||
19 | #include "lauxlib.h" | ||
20 | #include "lualib.h" | ||
21 | |||
22 | |||
23 | /* macro to `unsign' a character */ | ||
24 | #define uchar(c) ((unsigned char)(c)) | ||
25 | |||
26 | |||
27 | |||
28 | static int str_len (lua_State *L) { | ||
29 | size_t l; | ||
30 | luaL_checklstring(L, 1, &l); | ||
31 | lua_pushinteger(L, l); | ||
32 | return 1; | ||
33 | } | ||
34 | |||
35 | |||
36 | static ptrdiff_t posrelat (ptrdiff_t pos, size_t len) { | ||
37 | /* relative string position: negative means back from end */ | ||
38 | if (pos < 0) pos += (ptrdiff_t)len + 1; | ||
39 | return (pos >= 0) ? pos : 0; | ||
40 | } | ||
41 | |||
42 | |||
43 | static int str_sub (lua_State *L) { | ||
44 | size_t l; | ||
45 | const char *s = luaL_checklstring(L, 1, &l); | ||
46 | ptrdiff_t start = posrelat(luaL_checkinteger(L, 2), l); | ||
47 | ptrdiff_t end = posrelat(luaL_optinteger(L, 3, -1), l); | ||
48 | if (start < 1) start = 1; | ||
49 | if (end > (ptrdiff_t)l) end = (ptrdiff_t)l; | ||
50 | if (start <= end) | ||
51 | lua_pushlstring(L, s+start-1, end-start+1); | ||
52 | else lua_pushliteral(L, ""); | ||
53 | return 1; | ||
54 | } | ||
55 | |||
56 | |||
57 | static int str_reverse (lua_State *L) { | ||
58 | size_t l; | ||
59 | luaL_Buffer b; | ||
60 | const char *s = luaL_checklstring(L, 1, &l); | ||
61 | luaL_buffinit(L, &b); | ||
62 | while (l--) luaL_addchar(&b, s[l]); | ||
63 | luaL_pushresult(&b); | ||
64 | return 1; | ||
65 | } | ||
66 | |||
67 | |||
68 | static int str_lower (lua_State *L) { | ||
69 | size_t l; | ||
70 | size_t i; | ||
71 | luaL_Buffer b; | ||
72 | const char *s = luaL_checklstring(L, 1, &l); | ||
73 | luaL_buffinit(L, &b); | ||
74 | for (i=0; i<l; i++) | ||
75 | luaL_addchar(&b, tolower(uchar(s[i]))); | ||
76 | luaL_pushresult(&b); | ||
77 | return 1; | ||
78 | } | ||
79 | |||
80 | |||
81 | static int str_upper (lua_State *L) { | ||
82 | size_t l; | ||
83 | size_t i; | ||
84 | luaL_Buffer b; | ||
85 | const char *s = luaL_checklstring(L, 1, &l); | ||
86 | luaL_buffinit(L, &b); | ||
87 | for (i=0; i<l; i++) | ||
88 | luaL_addchar(&b, toupper(uchar(s[i]))); | ||
89 | luaL_pushresult(&b); | ||
90 | return 1; | ||
91 | } | ||
92 | |||
93 | static int str_rep (lua_State *L) { | ||
94 | size_t l; | ||
95 | luaL_Buffer b; | ||
96 | const char *s = luaL_checklstring(L, 1, &l); | ||
97 | int n = luaL_checkint(L, 2); | ||
98 | luaL_buffinit(L, &b); | ||
99 | while (n-- > 0) | ||
100 | luaL_addlstring(&b, s, l); | ||
101 | luaL_pushresult(&b); | ||
102 | return 1; | ||
103 | } | ||
104 | |||
105 | |||
106 | static int str_byte (lua_State *L) { | ||
107 | size_t l; | ||
108 | const char *s = luaL_checklstring(L, 1, &l); | ||
109 | ptrdiff_t posi = posrelat(luaL_optinteger(L, 2, 1), l); | ||
110 | ptrdiff_t pose = posrelat(luaL_optinteger(L, 3, posi), l); | ||
111 | int n, i; | ||
112 | if (posi <= 0) posi = 1; | ||
113 | if ((size_t)pose > l) pose = l; | ||
114 | if (posi > pose) return 0; /* empty interval; return no values */ | ||
115 | n = (int)(pose - posi + 1); | ||
116 | if (posi + n <= pose) /* overflow? */ | ||
117 | luaL_error(L, "string slice too long"); | ||
118 | luaL_checkstack(L, n, "string slice too long"); | ||
119 | for (i=0; i<n; i++) | ||
120 | lua_pushinteger(L, uchar(s[posi+i-1])); | ||
121 | return n; | ||
122 | } | ||
123 | |||
124 | |||
125 | static int str_char (lua_State *L) { | ||
126 | int n = lua_gettop(L); /* number of arguments */ | ||
127 | int i; | ||
128 | luaL_Buffer b; | ||
129 | luaL_buffinit(L, &b); | ||
130 | for (i=1; i<=n; i++) { | ||
131 | int c = luaL_checkint(L, i); | ||
132 | luaL_argcheck(L, uchar(c) == c, i, "invalid value"); | ||
133 | luaL_addchar(&b, uchar(c)); | ||
134 | } | ||
135 | luaL_pushresult(&b); | ||
136 | return 1; | ||
137 | } | ||
138 | |||
139 | |||
140 | static int writer (lua_State *L, const void* b, size_t size, void* B) { | ||
141 | (void)L; | ||
142 | luaL_addlstring((luaL_Buffer*) B, (const char *)b, size); | ||
143 | return 0; | ||
144 | } | ||
145 | |||
146 | |||
147 | static int str_dump (lua_State *L) { | ||
148 | luaL_Buffer b; | ||
149 | luaL_checktype(L, 1, LUA_TFUNCTION); | ||
150 | lua_settop(L, 1); | ||
151 | luaL_buffinit(L,&b); | ||
152 | if (lua_dump(L, writer, &b) != 0) | ||
153 | luaL_error(L, "unable to dump given function"); | ||
154 | luaL_pushresult(&b); | ||
155 | return 1; | ||
156 | } | ||
157 | |||
158 | |||
159 | |||
160 | /* | ||
161 | ** {====================================================== | ||
162 | ** PATTERN MATCHING | ||
163 | ** ======================================================= | ||
164 | */ | ||
165 | |||
166 | |||
167 | #define CAP_UNFINISHED (-1) | ||
168 | #define CAP_POSITION (-2) | ||
169 | |||
170 | typedef struct MatchState { | ||
171 | const char *src_init; /* init of source string */ | ||
172 | const char *src_end; /* end (`\0') of source string */ | ||
173 | lua_State *L; | ||
174 | int level; /* total number of captures (finished or unfinished) */ | ||
175 | struct { | ||
176 | const char *init; | ||
177 | ptrdiff_t len; | ||
178 | } capture[LUA_MAXCAPTURES]; | ||
179 | } MatchState; | ||
180 | |||
181 | |||
182 | #define L_ESC '%' | ||
183 | #define SPECIALS "^$*+?.([%-" | ||
184 | |||
185 | |||
186 | static int check_capture (MatchState *ms, int l) { | ||
187 | l -= '1'; | ||
188 | if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED) | ||
189 | return luaL_error(ms->L, "invalid capture index"); | ||
190 | return l; | ||
191 | } | ||
192 | |||
193 | |||
194 | static int capture_to_close (MatchState *ms) { | ||
195 | int level = ms->level; | ||
196 | for (level--; level>=0; level--) | ||
197 | if (ms->capture[level].len == CAP_UNFINISHED) return level; | ||
198 | return luaL_error(ms->L, "invalid pattern capture"); | ||
199 | } | ||
200 | |||
201 | |||
202 | static const char *classend (MatchState *ms, const char *p) { | ||
203 | switch (*p++) { | ||
204 | case L_ESC: { | ||
205 | if (*p == '\0') | ||
206 | luaL_error(ms->L, "malformed pattern (ends with " LUA_QL("%%") ")"); | ||
207 | return p+1; | ||
208 | } | ||
209 | case '[': { | ||
210 | if (*p == '^') p++; | ||
211 | do { /* look for a `]' */ | ||
212 | if (*p == '\0') | ||
213 | luaL_error(ms->L, "malformed pattern (missing " LUA_QL("]") ")"); | ||
214 | if (*(p++) == L_ESC && *p != '\0') | ||
215 | p++; /* skip escapes (e.g. `%]') */ | ||
216 | } while (*p != ']'); | ||
217 | return p+1; | ||
218 | } | ||
219 | default: { | ||
220 | return p; | ||
221 | } | ||
222 | } | ||
223 | } | ||
224 | |||
225 | |||
226 | static int match_class (int c, int cl) { | ||
227 | int res; | ||
228 | switch (tolower(cl)) { | ||
229 | case 'a' : res = isalpha(c); break; | ||
230 | case 'c' : res = iscntrl(c); break; | ||
231 | case 'd' : res = isdigit(c); break; | ||
232 | case 'l' : res = islower(c); break; | ||
233 | case 'p' : res = ispunct(c); break; | ||
234 | case 's' : res = isspace(c); break; | ||
235 | case 'u' : res = isupper(c); break; | ||
236 | case 'w' : res = isalnum(c); break; | ||
237 | case 'x' : res = isxdigit(c); break; | ||
238 | case 'z' : res = (c == 0); break; | ||
239 | default: return (cl == c); | ||
240 | } | ||
241 | return (islower(cl) ? res : !res); | ||
242 | } | ||
243 | |||
244 | |||
245 | static int matchbracketclass (int c, const char *p, const char *ec) { | ||
246 | int sig = 1; | ||
247 | if (*(p+1) == '^') { | ||
248 | sig = 0; | ||
249 | p++; /* skip the `^' */ | ||
250 | } | ||
251 | while (++p < ec) { | ||
252 | if (*p == L_ESC) { | ||
253 | p++; | ||
254 | if (match_class(c, uchar(*p))) | ||
255 | return sig; | ||
256 | } | ||
257 | else if ((*(p+1) == '-') && (p+2 < ec)) { | ||
258 | p+=2; | ||
259 | if (uchar(*(p-2)) <= c && c <= uchar(*p)) | ||
260 | return sig; | ||
261 | } | ||
262 | else if (uchar(*p) == c) return sig; | ||
263 | } | ||
264 | return !sig; | ||
265 | } | ||
266 | |||
267 | |||
268 | static int singlematch (int c, const char *p, const char *ep) { | ||
269 | switch (*p) { | ||
270 | case '.': return 1; /* matches any char */ | ||
271 | case L_ESC: return match_class(c, uchar(*(p+1))); | ||
272 | case '[': return matchbracketclass(c, p, ep-1); | ||
273 | default: return (uchar(*p) == c); | ||
274 | } | ||
275 | } | ||
276 | |||
277 | |||
278 | static const char *match (MatchState *ms, const char *s, const char *p); | ||
279 | |||
280 | |||
281 | static const char *matchbalance (MatchState *ms, const char *s, | ||
282 | const char *p) { | ||
283 | if (*p == 0 || *(p+1) == 0) | ||
284 | luaL_error(ms->L, "unbalanced pattern"); | ||
285 | if (*s != *p) return NULL; | ||
286 | else { | ||
287 | int b = *p; | ||
288 | int e = *(p+1); | ||
289 | int cont = 1; | ||
290 | while (++s < ms->src_end) { | ||
291 | if (*s == e) { | ||
292 | if (--cont == 0) return s+1; | ||
293 | } | ||
294 | else if (*s == b) cont++; | ||
295 | } | ||
296 | } | ||
297 | return NULL; /* string ends out of balance */ | ||
298 | } | ||
299 | |||
300 | |||
301 | static const char *max_expand (MatchState *ms, const char *s, | ||
302 | const char *p, const char *ep) { | ||
303 | ptrdiff_t i = 0; /* counts maximum expand for item */ | ||
304 | while ((s+i)<ms->src_end && singlematch(uchar(*(s+i)), p, ep)) | ||
305 | i++; | ||
306 | /* keeps trying to match with the maximum repetitions */ | ||
307 | while (i>=0) { | ||
308 | const char *res = match(ms, (s+i), ep+1); | ||
309 | if (res) return res; | ||
310 | i--; /* else didn't match; reduce 1 repetition to try again */ | ||
311 | } | ||
312 | return NULL; | ||
313 | } | ||
314 | |||
315 | |||
316 | static const char *min_expand (MatchState *ms, const char *s, | ||
317 | const char *p, const char *ep) { | ||
318 | for (;;) { | ||
319 | const char *res = match(ms, s, ep+1); | ||
320 | if (res != NULL) | ||
321 | return res; | ||
322 | else if (s<ms->src_end && singlematch(uchar(*s), p, ep)) | ||
323 | s++; /* try with one more repetition */ | ||
324 | else return NULL; | ||
325 | } | ||
326 | } | ||
327 | |||
328 | |||
329 | static const char *start_capture (MatchState *ms, const char *s, | ||
330 | const char *p, int what) { | ||
331 | const char *res; | ||
332 | int level = ms->level; | ||
333 | if (level >= LUA_MAXCAPTURES) luaL_error(ms->L, "too many captures"); | ||
334 | ms->capture[level].init = s; | ||
335 | ms->capture[level].len = what; | ||
336 | ms->level = level+1; | ||
337 | if ((res=match(ms, s, p)) == NULL) /* match failed? */ | ||
338 | ms->level--; /* undo capture */ | ||
339 | return res; | ||
340 | } | ||
341 | |||
342 | |||
343 | static const char *end_capture (MatchState *ms, const char *s, | ||
344 | const char *p) { | ||
345 | int l = capture_to_close(ms); | ||
346 | const char *res; | ||
347 | ms->capture[l].len = s - ms->capture[l].init; /* close capture */ | ||
348 | if ((res = match(ms, s, p)) == NULL) /* match failed? */ | ||
349 | ms->capture[l].len = CAP_UNFINISHED; /* undo capture */ | ||
350 | return res; | ||
351 | } | ||
352 | |||
353 | |||
354 | static const char *match_capture (MatchState *ms, const char *s, int l) { | ||
355 | size_t len; | ||
356 | l = check_capture(ms, l); | ||
357 | len = ms->capture[l].len; | ||
358 | if ((size_t)(ms->src_end-s) >= len && | ||
359 | memcmp(ms->capture[l].init, s, len) == 0) | ||
360 | return s+len; | ||
361 | else return NULL; | ||
362 | } | ||
363 | |||
364 | |||
365 | static const char *match (MatchState *ms, const char *s, const char *p) { | ||
366 | init: /* using goto's to optimize tail recursion */ | ||
367 | switch (*p) { | ||
368 | case '(': { /* start capture */ | ||
369 | if (*(p+1) == ')') /* position capture? */ | ||
370 | return start_capture(ms, s, p+2, CAP_POSITION); | ||
371 | else | ||
372 | return start_capture(ms, s, p+1, CAP_UNFINISHED); | ||
373 | } | ||
374 | case ')': { /* end capture */ | ||
375 | return end_capture(ms, s, p+1); | ||
376 | } | ||
377 | case L_ESC: { | ||
378 | switch (*(p+1)) { | ||
379 | case 'b': { /* balanced string? */ | ||
380 | s = matchbalance(ms, s, p+2); | ||
381 | if (s == NULL) return NULL; | ||
382 | p+=4; goto init; /* else return match(ms, s, p+4); */ | ||
383 | } | ||
384 | case 'f': { /* frontier? */ | ||
385 | const char *ep; char previous; | ||
386 | p += 2; | ||
387 | if (*p != '[') | ||
388 | luaL_error(ms->L, "missing " LUA_QL("[") " after " | ||
389 | LUA_QL("%%f") " in pattern"); | ||
390 | ep = classend(ms, p); /* points to what is next */ | ||
391 | previous = (s == ms->src_init) ? '\0' : *(s-1); | ||
392 | if (matchbracketclass(uchar(previous), p, ep-1) || | ||
393 | !matchbracketclass(uchar(*s), p, ep-1)) return NULL; | ||
394 | p=ep; goto init; /* else return match(ms, s, ep); */ | ||
395 | } | ||
396 | default: { | ||
397 | if (isdigit(uchar(*(p+1)))) { /* capture results (%0-%9)? */ | ||
398 | s = match_capture(ms, s, uchar(*(p+1))); | ||
399 | if (s == NULL) return NULL; | ||
400 | p+=2; goto init; /* else return match(ms, s, p+2) */ | ||
401 | } | ||
402 | goto dflt; /* case default */ | ||
403 | } | ||
404 | } | ||
405 | } | ||
406 | case '\0': { /* end of pattern */ | ||
407 | return s; /* match succeeded */ | ||
408 | } | ||
409 | case '$': { | ||
410 | if (*(p+1) == '\0') /* is the `$' the last char in pattern? */ | ||
411 | return (s == ms->src_end) ? s : NULL; /* check end of string */ | ||
412 | else goto dflt; | ||
413 | } | ||
414 | default: dflt: { /* it is a pattern item */ | ||
415 | const char *ep = classend(ms, p); /* points to what is next */ | ||
416 | int m = s<ms->src_end && singlematch(uchar(*s), p, ep); | ||
417 | switch (*ep) { | ||
418 | case '?': { /* optional */ | ||
419 | const char *res; | ||
420 | if (m && ((res=match(ms, s+1, ep+1)) != NULL)) | ||
421 | return res; | ||
422 | p=ep+1; goto init; /* else return match(ms, s, ep+1); */ | ||
423 | } | ||
424 | case '*': { /* 0 or more repetitions */ | ||
425 | return max_expand(ms, s, p, ep); | ||
426 | } | ||
427 | case '+': { /* 1 or more repetitions */ | ||
428 | return (m ? max_expand(ms, s+1, p, ep) : NULL); | ||
429 | } | ||
430 | case '-': { /* 0 or more repetitions (minimum) */ | ||
431 | return min_expand(ms, s, p, ep); | ||
432 | } | ||
433 | default: { | ||
434 | if (!m) return NULL; | ||
435 | s++; p=ep; goto init; /* else return match(ms, s+1, ep); */ | ||
436 | } | ||
437 | } | ||
438 | } | ||
439 | } | ||
440 | } | ||
441 | |||
442 | |||
443 | |||
444 | static const char *lmemfind (const char *s1, size_t l1, | ||
445 | const char *s2, size_t l2) { | ||
446 | if (l2 == 0) return s1; /* empty strings are everywhere */ | ||
447 | else if (l2 > l1) return NULL; /* avoids a negative `l1' */ | ||
448 | else { | ||
449 | const char *init; /* to search for a `*s2' inside `s1' */ | ||
450 | l2--; /* 1st char will be checked by `memchr' */ | ||
451 | l1 = l1-l2; /* `s2' cannot be found after that */ | ||
452 | while (l1 > 0 && (init = (const char *)memchr(s1, *s2, l1)) != NULL) { | ||
453 | init++; /* 1st char is already checked */ | ||
454 | if (memcmp(init, s2+1, l2) == 0) | ||
455 | return init-1; | ||
456 | else { /* correct `l1' and `s1' to try again */ | ||
457 | l1 -= init-s1; | ||
458 | s1 = init; | ||
459 | } | ||
460 | } | ||
461 | return NULL; /* not found */ | ||
462 | } | ||
463 | } | ||
464 | |||
465 | |||
466 | static void push_onecapture (MatchState *ms, int i, const char *s, | ||
467 | const char *e) { | ||
468 | if (i >= ms->level) { | ||
469 | if (i == 0) /* ms->level == 0, too */ | ||
470 | lua_pushlstring(ms->L, s, e - s); /* add whole match */ | ||
471 | else | ||
472 | luaL_error(ms->L, "invalid capture index"); | ||
473 | } | ||
474 | else { | ||
475 | ptrdiff_t l = ms->capture[i].len; | ||
476 | if (l == CAP_UNFINISHED) luaL_error(ms->L, "unfinished capture"); | ||
477 | if (l == CAP_POSITION) | ||
478 | lua_pushinteger(ms->L, ms->capture[i].init - ms->src_init + 1); | ||
479 | else | ||
480 | lua_pushlstring(ms->L, ms->capture[i].init, l); | ||
481 | } | ||
482 | } | ||
483 | |||
484 | |||
485 | static int push_captures (MatchState *ms, const char *s, const char *e) { | ||
486 | int i; | ||
487 | int nlevels = (ms->level == 0 && s) ? 1 : ms->level; | ||
488 | luaL_checkstack(ms->L, nlevels, "too many captures"); | ||
489 | for (i = 0; i < nlevels; i++) | ||
490 | push_onecapture(ms, i, s, e); | ||
491 | return nlevels; /* number of strings pushed */ | ||
492 | } | ||
493 | |||
494 | |||
495 | static int str_find_aux (lua_State *L, int find) { | ||
496 | size_t l1, l2; | ||
497 | const char *s = luaL_checklstring(L, 1, &l1); | ||
498 | const char *p = luaL_checklstring(L, 2, &l2); | ||
499 | ptrdiff_t init = posrelat(luaL_optinteger(L, 3, 1), l1) - 1; | ||
500 | if (init < 0) init = 0; | ||
501 | else if ((size_t)(init) > l1) init = (ptrdiff_t)l1; | ||
502 | if (find && (lua_toboolean(L, 4) || /* explicit request? */ | ||
503 | strpbrk(p, SPECIALS) == NULL)) { /* or no special characters? */ | ||
504 | /* do a plain search */ | ||
505 | const char *s2 = lmemfind(s+init, l1-init, p, l2); | ||
506 | if (s2) { | ||
507 | lua_pushinteger(L, s2-s+1); | ||
508 | lua_pushinteger(L, s2-s+l2); | ||
509 | return 2; | ||
510 | } | ||
511 | } | ||
512 | else { | ||
513 | MatchState ms; | ||
514 | int anchor = (*p == '^') ? (p++, 1) : 0; | ||
515 | const char *s1=s+init; | ||
516 | ms.L = L; | ||
517 | ms.src_init = s; | ||
518 | ms.src_end = s+l1; | ||
519 | do { | ||
520 | const char *res; | ||
521 | ms.level = 0; | ||
522 | if ((res=match(&ms, s1, p)) != NULL) { | ||
523 | if (find) { | ||
524 | lua_pushinteger(L, s1-s+1); /* start */ | ||
525 | lua_pushinteger(L, res-s); /* end */ | ||
526 | return push_captures(&ms, NULL, 0) + 2; | ||
527 | } | ||
528 | else | ||
529 | return push_captures(&ms, s1, res); | ||
530 | } | ||
531 | } while (s1++ < ms.src_end && !anchor); | ||
532 | } | ||
533 | lua_pushnil(L); /* not found */ | ||
534 | return 1; | ||
535 | } | ||
536 | |||
537 | |||
538 | static int str_find (lua_State *L) { | ||
539 | return str_find_aux(L, 1); | ||
540 | } | ||
541 | |||
542 | |||
543 | static int str_match (lua_State *L) { | ||
544 | return str_find_aux(L, 0); | ||
545 | } | ||
546 | |||
547 | |||
548 | static int gmatch_aux (lua_State *L) { | ||
549 | MatchState ms; | ||
550 | size_t ls; | ||
551 | const char *s = lua_tolstring(L, lua_upvalueindex(1), &ls); | ||
552 | const char *p = lua_tostring(L, lua_upvalueindex(2)); | ||
553 | const char *src; | ||
554 | ms.L = L; | ||
555 | ms.src_init = s; | ||
556 | ms.src_end = s+ls; | ||
557 | for (src = s + (size_t)lua_tointeger(L, lua_upvalueindex(3)); | ||
558 | src <= ms.src_end; | ||
559 | src++) { | ||
560 | const char *e; | ||
561 | ms.level = 0; | ||
562 | if ((e = match(&ms, src, p)) != NULL) { | ||
563 | lua_Integer newstart = e-s; | ||
564 | if (e == src) newstart++; /* empty match? go at least one position */ | ||
565 | lua_pushinteger(L, newstart); | ||
566 | lua_replace(L, lua_upvalueindex(3)); | ||
567 | return push_captures(&ms, src, e); | ||
568 | } | ||
569 | } | ||
570 | return 0; /* not found */ | ||
571 | } | ||
572 | |||
573 | |||
574 | static int gmatch (lua_State *L) { | ||
575 | luaL_checkstring(L, 1); | ||
576 | luaL_checkstring(L, 2); | ||
577 | lua_settop(L, 2); | ||
578 | lua_pushinteger(L, 0); | ||
579 | lua_pushcclosure(L, gmatch_aux, 3); | ||
580 | return 1; | ||
581 | } | ||
582 | |||
583 | |||
584 | static int gfind_nodef (lua_State *L) { | ||
585 | return luaL_error(L, LUA_QL("string.gfind") " was renamed to " | ||
586 | LUA_QL("string.gmatch")); | ||
587 | } | ||
588 | |||
589 | |||
590 | static void add_s (MatchState *ms, luaL_Buffer *b, const char *s, | ||
591 | const char *e) { | ||
592 | size_t l, i; | ||
593 | const char *news = lua_tolstring(ms->L, 3, &l); | ||
594 | for (i = 0; i < l; i++) { | ||
595 | if (news[i] != L_ESC) | ||
596 | luaL_addchar(b, news[i]); | ||
597 | else { | ||
598 | i++; /* skip ESC */ | ||
599 | if (!isdigit(uchar(news[i]))) | ||
600 | luaL_addchar(b, news[i]); | ||
601 | else if (news[i] == '0') | ||
602 | luaL_addlstring(b, s, e - s); | ||
603 | else { | ||
604 | push_onecapture(ms, news[i] - '1', s, e); | ||
605 | luaL_addvalue(b); /* add capture to accumulated result */ | ||
606 | } | ||
607 | } | ||
608 | } | ||
609 | } | ||
610 | |||
611 | |||
612 | static void add_value (MatchState *ms, luaL_Buffer *b, const char *s, | ||
613 | const char *e) { | ||
614 | lua_State *L = ms->L; | ||
615 | switch (lua_type(L, 3)) { | ||
616 | case LUA_TNUMBER: | ||
617 | case LUA_TSTRING: { | ||
618 | add_s(ms, b, s, e); | ||
619 | return; | ||
620 | } | ||
621 | case LUA_TFUNCTION: { | ||
622 | int n; | ||
623 | lua_pushvalue(L, 3); | ||
624 | n = push_captures(ms, s, e); | ||
625 | lua_call(L, n, 1); | ||
626 | break; | ||
627 | } | ||
628 | case LUA_TTABLE: { | ||
629 | push_onecapture(ms, 0, s, e); | ||
630 | lua_gettable(L, 3); | ||
631 | break; | ||
632 | } | ||
633 | } | ||
634 | if (!lua_toboolean(L, -1)) { /* nil or false? */ | ||
635 | lua_pop(L, 1); | ||
636 | lua_pushlstring(L, s, e - s); /* keep original text */ | ||
637 | } | ||
638 | else if (!lua_isstring(L, -1)) | ||
639 | luaL_error(L, "invalid replacement value (a %s)", luaL_typename(L, -1)); | ||
640 | luaL_addvalue(b); /* add result to accumulator */ | ||
641 | } | ||
642 | |||
643 | |||
644 | static int str_gsub (lua_State *L) { | ||
645 | size_t srcl; | ||
646 | const char *src = luaL_checklstring(L, 1, &srcl); | ||
647 | const char *p = luaL_checkstring(L, 2); | ||
648 | int tr = lua_type(L, 3); | ||
649 | int max_s = luaL_optint(L, 4, srcl+1); | ||
650 | int anchor = (*p == '^') ? (p++, 1) : 0; | ||
651 | int n = 0; | ||
652 | MatchState ms; | ||
653 | luaL_Buffer b; | ||
654 | luaL_argcheck(L, tr == LUA_TNUMBER || tr == LUA_TSTRING || | ||
655 | tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3, | ||
656 | "string/function/table expected"); | ||
657 | luaL_buffinit(L, &b); | ||
658 | ms.L = L; | ||
659 | ms.src_init = src; | ||
660 | ms.src_end = src+srcl; | ||
661 | while (n < max_s) { | ||
662 | const char *e; | ||
663 | ms.level = 0; | ||
664 | e = match(&ms, src, p); | ||
665 | if (e) { | ||
666 | n++; | ||
667 | add_value(&ms, &b, src, e); | ||
668 | } | ||
669 | if (e && e>src) /* non empty match? */ | ||
670 | src = e; /* skip it */ | ||
671 | else if (src < ms.src_end) | ||
672 | luaL_addchar(&b, *src++); | ||
673 | else break; | ||
674 | if (anchor) break; | ||
675 | } | ||
676 | luaL_addlstring(&b, src, ms.src_end-src); | ||
677 | luaL_pushresult(&b); | ||
678 | lua_pushinteger(L, n); /* number of substitutions */ | ||
679 | return 2; | ||
680 | } | ||
681 | |||
682 | /* }====================================================== */ | ||
683 | |||
684 | |||
685 | /* maximum size of each formatted item (> len(format('%99.99f', -1e308))) */ | ||
686 | #define MAX_ITEM 512 | ||
687 | /* valid flags in a format specification */ | ||
688 | #define FLAGS "-+ #0" | ||
689 | /* | ||
690 | ** maximum size of each format specification (such as '%-099.99d') | ||
691 | ** (+10 accounts for %99.99x plus margin of error) | ||
692 | */ | ||
693 | #define MAX_FORMAT (sizeof(FLAGS) + sizeof(LUA_INTFRMLEN) + 10) | ||
694 | |||
695 | |||
696 | static void addquoted (lua_State *L, luaL_Buffer *b, int arg) { | ||
697 | size_t l; | ||
698 | const char *s = luaL_checklstring(L, arg, &l); | ||
699 | luaL_addchar(b, '"'); | ||
700 | while (l--) { | ||
701 | switch (*s) { | ||
702 | case '"': case '\\': case '\n': { | ||
703 | luaL_addchar(b, '\\'); | ||
704 | luaL_addchar(b, *s); | ||
705 | break; | ||
706 | } | ||
707 | case '\r': { | ||
708 | luaL_addlstring(b, "\\r", 2); | ||
709 | break; | ||
710 | } | ||
711 | case '\0': { | ||
712 | luaL_addlstring(b, "\\000", 4); | ||
713 | break; | ||
714 | } | ||
715 | default: { | ||
716 | luaL_addchar(b, *s); | ||
717 | break; | ||
718 | } | ||
719 | } | ||
720 | s++; | ||
721 | } | ||
722 | luaL_addchar(b, '"'); | ||
723 | } | ||
724 | |||
725 | static const char *scanformat (lua_State *L, const char *strfrmt, char *form) { | ||
726 | const char *p = strfrmt; | ||
727 | while (*p != '\0' && strchr(FLAGS, *p) != NULL) p++; /* skip flags */ | ||
728 | if ((size_t)(p - strfrmt) >= sizeof(FLAGS)) | ||
729 | luaL_error(L, "invalid format (repeated flags)"); | ||
730 | if (isdigit(uchar(*p))) p++; /* skip width */ | ||
731 | if (isdigit(uchar(*p))) p++; /* (2 digits at most) */ | ||
732 | if (*p == '.') { | ||
733 | p++; | ||
734 | if (isdigit(uchar(*p))) p++; /* skip precision */ | ||
735 | if (isdigit(uchar(*p))) p++; /* (2 digits at most) */ | ||
736 | } | ||
737 | if (isdigit(uchar(*p))) | ||
738 | luaL_error(L, "invalid format (width or precision too long)"); | ||
739 | *(form++) = '%'; | ||
740 | strncpy(form, strfrmt, p - strfrmt + 1); | ||
741 | form += p - strfrmt + 1; | ||
742 | *form = '\0'; | ||
743 | return p; | ||
744 | } | ||
745 | |||
746 | |||
747 | static void addintlen (char *form) { | ||
748 | size_t l = strlen(form); | ||
749 | char spec = form[l - 1]; | ||
750 | strcpy(form + l - 1, LUA_INTFRMLEN); | ||
751 | form[l + sizeof(LUA_INTFRMLEN) - 2] = spec; | ||
752 | form[l + sizeof(LUA_INTFRMLEN) - 1] = '\0'; | ||
753 | } | ||
754 | |||
755 | |||
756 | static int str_format (lua_State *L) { | ||
757 | int top = lua_gettop(L); | ||
758 | int arg = 1; | ||
759 | size_t sfl; | ||
760 | const char *strfrmt = luaL_checklstring(L, arg, &sfl); | ||
761 | const char *strfrmt_end = strfrmt+sfl; | ||
762 | luaL_Buffer b; | ||
763 | luaL_buffinit(L, &b); | ||
764 | while (strfrmt < strfrmt_end) { | ||
765 | if (*strfrmt != L_ESC) | ||
766 | luaL_addchar(&b, *strfrmt++); | ||
767 | else if (*++strfrmt == L_ESC) | ||
768 | luaL_addchar(&b, *strfrmt++); /* %% */ | ||
769 | else { /* format item */ | ||
770 | char form[MAX_FORMAT]; /* to store the format (`%...') */ | ||
771 | char buff[MAX_ITEM]; /* to store the formatted item */ | ||
772 | if (++arg > top) | ||
773 | luaL_argerror(L, arg, "no value"); | ||
774 | strfrmt = scanformat(L, strfrmt, form); | ||
775 | switch (*strfrmt++) { | ||
776 | case 'c': { | ||
777 | sprintf(buff, form, (int)luaL_checknumber(L, arg)); | ||
778 | break; | ||
779 | } | ||
780 | case 'd': case 'i': { | ||
781 | addintlen(form); | ||
782 | sprintf(buff, form, (LUA_INTFRM_T)luaL_checknumber(L, arg)); | ||
783 | break; | ||
784 | } | ||
785 | case 'o': case 'u': case 'x': case 'X': { | ||
786 | addintlen(form); | ||
787 | sprintf(buff, form, (unsigned LUA_INTFRM_T)luaL_checknumber(L, arg)); | ||
788 | break; | ||
789 | } | ||
790 | case 'e': case 'E': case 'f': | ||
791 | case 'g': case 'G': { | ||
792 | sprintf(buff, form, (double)luaL_checknumber(L, arg)); | ||
793 | break; | ||
794 | } | ||
795 | case 'q': { | ||
796 | addquoted(L, &b, arg); | ||
797 | continue; /* skip the 'addsize' at the end */ | ||
798 | } | ||
799 | case 's': { | ||
800 | size_t l; | ||
801 | const char *s = luaL_checklstring(L, arg, &l); | ||
802 | if (!strchr(form, '.') && l >= 100) { | ||
803 | /* no precision and string is too long to be formatted; | ||
804 | keep original string */ | ||
805 | lua_pushvalue(L, arg); | ||
806 | luaL_addvalue(&b); | ||
807 | continue; /* skip the `addsize' at the end */ | ||
808 | } | ||
809 | else { | ||
810 | sprintf(buff, form, s); | ||
811 | break; | ||
812 | } | ||
813 | } | ||
814 | default: { /* also treat cases `pnLlh' */ | ||
815 | return luaL_error(L, "invalid option " LUA_QL("%%%c") " to " | ||
816 | LUA_QL("format"), *(strfrmt - 1)); | ||
817 | } | ||
818 | } | ||
819 | luaL_addlstring(&b, buff, strlen(buff)); | ||
820 | } | ||
821 | } | ||
822 | luaL_pushresult(&b); | ||
823 | return 1; | ||
824 | } | ||
825 | |||
826 | |||
827 | static const luaL_Reg strlib[] = { | ||
828 | {"byte", str_byte}, | ||
829 | {"char", str_char}, | ||
830 | {"dump", str_dump}, | ||
831 | {"find", str_find}, | ||
832 | {"format", str_format}, | ||
833 | {"gfind", gfind_nodef}, | ||
834 | {"gmatch", gmatch}, | ||
835 | {"gsub", str_gsub}, | ||
836 | {"len", str_len}, | ||
837 | {"lower", str_lower}, | ||
838 | {"match", str_match}, | ||
839 | {"rep", str_rep}, | ||
840 | {"reverse", str_reverse}, | ||
841 | {"sub", str_sub}, | ||
842 | {"upper", str_upper}, | ||
843 | {NULL, NULL} | ||
844 | }; | ||
845 | |||
846 | |||
847 | static void createmetatable (lua_State *L) { | ||
848 | lua_createtable(L, 0, 1); /* create metatable for strings */ | ||
849 | lua_pushliteral(L, ""); /* dummy string */ | ||
850 | lua_pushvalue(L, -2); | ||
851 | lua_setmetatable(L, -2); /* set string metatable */ | ||
852 | lua_pop(L, 1); /* pop dummy string */ | ||
853 | lua_pushvalue(L, -2); /* string library... */ | ||
854 | lua_setfield(L, -2, "__index"); /* ...is the __index metamethod */ | ||
855 | lua_pop(L, 1); /* pop metatable */ | ||
856 | } | ||
857 | |||
858 | |||
859 | /* | ||
860 | ** Open string library | ||
861 | */ | ||
862 | LUALIB_API int luaopen_string (lua_State *L) { | ||
863 | luaL_register(L, LUA_STRLIBNAME, strlib); | ||
864 | #if defined(LUA_COMPAT_GFIND) | ||
865 | lua_getfield(L, -1, "gmatch"); | ||
866 | lua_setfield(L, -2, "gfind"); | ||
867 | #endif | ||
868 | createmetatable(L); | ||
869 | return 1; | ||
870 | } | ||
871 | |||